Definition of CS gas noun from the Oxford Advanced American Dictionary

 

CS gas

 noun
noun
NAmE//ˌsi ɛs ˈɡæs//
 
[uncountable]
 
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a gas that stings the eyes, producing tears and making it difficult to breathe. CS gas is sometimes used to control crowds. see also tear gas
See the Oxford Advanced Learner's Dictionary entry: CS gas